AMITA4 14.3X19 Left Hand Aluminum Propeller

Function and Technical Context

This four-blade aluminum AMITA4 propeller with a diameter of 14.3 inches and pitch of 19 inches acts as the final link in the propulsion chain, transforming the rotational torque of the engine into effective hydraulic thrust on the water. Its left-hand rotation configuration makes it essential in counter-rotating dual propeller installations or in transmissions with reduction gearboxes with reverse direction from standard, where using an incorrectly rotating propeller would cause total loss of thrust and progressive damage to the shaft, seals, and stern bearings. The four-blade design provides balanced power absorption at medium and high load, minimizing cavitation under demanding navigation conditions and maintaining hull stability during planing. The 19-inch pitch orients this propeller toward propulsion units that prioritize top speed, while the 14.3-inch diameter ensures compatibility with medium-power stern units. Manufactured in aluminum, it offers a very competitive cost-to-performance ratio for recreational and professional use in clean and moderately demanding waters.

When to Replace This Part?

The most frequent signs that the propeller requires replacement are perceptible vibrations in the transom or rudder at medium and high RPM, noticeable drop in maximum speed or difficulty reaching planing RPM, and unjustified increase in fuel consumption; the leading edges should also be visually inspected for cavitation erosion, blade bending, or pitting from electrolytic corrosion, since aluminum is more susceptible to these phenomena than other propulsion materials. It is recommended to inspect the propeller at the beginning and end of each boating season, as well as after any impact with a floating object or the bottom, since even slight deformation unbalances the assembly and accelerates wear on the shaft seal and stern bearing. Replacing the propeller preventively at the slightest sign of damage prevents residual imbalance from resulting in costly transmission damage or off-season haul-outs.

Equivalent Manufacturer References